She wasn't kidding when she said she'd hit the ground running!

Prince Harry and Meghan Markle attended their first official engagement as the newly crowned Duke and Duchess of Sussex today, a mere three days after their lavish royal wedding.

They opted to put off the honeymoon so they could be in attendance for the celebration of Prince Charles' 70th birthday at Buckingham Palace. The former actress already looks comfortable with her in-laws, as she was joking around with Camilla and laughing with her husband's dad. Move over Kate, there's a new favorite in the family!

The new Her Royal Highness donned a demure pale pink Flavia dress from Goat with a matching custom Philip Treacy pink hat, which she accessorized with Tamara Mellon Siren pumps. Look closely and you'll see she's wearing sheer pantyhose, keeping in line with tradition.

MM broke out in a fit of giggles when a pesky bee wouldn't leave Harry alone as he attempted to praise Prince Charles with a speech!

"You have inspired William and I, and looking out here today it is clear to see that we are not alone. You have created an incredible body of work that has and will continue to make such a huge difference to so many people’s lives both here and around the world. With that lady and gentlemen, please can I ask you to join me in wishing the Prince of Wales a very happy birthday, six months ahead of his birthday. How very royal," Harry told the crowd at the garden party.

"So Pa, while I know that you’ve asked that today not be about you, you must forgive me if I don’t listen to you, much like when I was younger. And instead I ask everyone here to say a huge thank you to you for your incredible work over nearly 50 years," he added.

We are so obsessed with these newlyweds!